Tennis star Eugenie Bouchard is set for a multi-million dollar payout after winning a lawsuit following a fall in a locker room at the US Open.

The former Wimbledon finalist has successfully sued the US Tennis Association (USTA) after she slipped and banged her head on a wet floor after a game at Flushing Meadows in New York in 2015.

She said she suffered a “serious head injury” that changed the course of her career.

The Canadian claimed it was the USTA’s negligence that led to her slip and fall.

A jury has now determined the USTA was 75 per cent to blame and Bouchard was 25 per cent at fault

The 23-year-old was forced to withdraw from the tournament and was unable to complete a match for the rest of the season.

She is claiming damages for her physical and emotional suffering in bringing the lawsuit, which lasted nearly two and a half years, as well as lost earnings on and off the court.

Though she returned to the tour full-time at the beginning of the 2016 season, she has not progressed past the third round in any of the nine Grand Slam events since the injury.

The former world number five also fell out of the top 100 singles rankings for the first time in nearly five years last month.

Earlier this week, Bouchard told the jury in federal court in Brooklyn that she had taken two steps into the training area following her match when she lost her footing “and hit the back of my head on the floor.”

She recalled being in “shock” as she found herself “staring at the ceiling.”

She also testified she felt a burning sensation on her skin from what her lawyers say was a powerful cleaning solution left on the floor.

The player’s lawyer Benedict Morelli said: “When you get 75 per cent or better, you can’t ever complain about that.”

A hearing to determine the amount of compensation was starting today at the United States District Court for the Eastern District of New York.

Mr Morelli said he did not yet have an exact figure in mind but indicated that he expected to request millions of dollars in damages to recoup “all the revenue lost.”

The USTA had denied liability and said Bouchard should have known not to enter the area without being accompanied by a trainer or other tournament personnel.

It said staff followed usual guidelines and only put down the cleaning spray in the belief all the players and trainers had left for the day.